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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-08-2004, 01:18 AM   #1 (permalink)
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does anyone have any information on any DYI on making a heat shield of an air intake...like the materials needed? thanks
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Old 11-08-2004, 09:06 AM   #2 (permalink)
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opps sorry for the double post of this
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Old 11-10-2004, 10:32 AM   #3 (permalink)
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i've never made one before, but from what i hear people get aluminum or sheet metal and bend it to fit. Then use a 3-4 inch (depends on size of tube) circular drill to cut the hole. Use weather stripping to cover the edges for a good fit. I believe you could use metal shears or even a dremel to cut the metal. I want to give it a try but don't have the time right now. If you try it let us know how it goes.
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Old 11-10-2004, 11:09 AM   #4 (permalink)
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You want to use a NON heat conducting material to cover the intake, not aluminum or sheet metal. You want to BLOCK heat, not conduct it.
Although if the metal dosn't touch the intake and creates a rather sealed chamber, it should help out some, but a few degrees different on the intake pipe won't matter too much.
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Old 11-10-2004, 08:48 PM   #5 (permalink)
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Almost all intake pipes are made of mandrel bent aluminum including Dinan and JC intakes. Aluminium dissipates heat very quickly which is why it used. Yes, they are all powder coated to increase durability, looks, and keep it cooler, but none the less it is still made from aluminum. The only place the heat shield would theoretically touch the pipe is where it enters the hole, but the surface area to contact ratio would be so small and insignifant that heat conduction would not be an issue with any type of metal.

The purpose of the heat shield is to block engine heat, coming off the radiator, block, etc, from being sucked in by the intake. By creating this "chamber" hot air is not able to enter the intake tube and the cooler air from lower in the bumper (Dinan style) or outside (short RAM) will be allowed to enter the intake.
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Old 11-10-2004, 10:39 PM   #6 (permalink)
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alright so my post was sorta silly. my bad.

What about the plastic garbage can heatshield? heh
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Old 11-11-2004, 01:35 AM   #7 (permalink)
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Didn't mean to flame you there bro, i was just stating what I know from previous experience.

I've seen the plastic garbage heatshield and they look just like that, garbage. It also begins to melt on the edges that touch inside the engine compartment. I guess it's the poor man's short term heat shield just like some people call a debaffled air box the poor man's intake

BTW, 12" x 24"piece of sheet metal at Home Depot is $4.
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